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SIP Trunk to CME 4.2 no ringback

Hi all, I have this issue with ringback in only 1 direction, i have setup a SIP trunk on a Gateway to a SIP PBX... More detail on setup : PBX SIP> to Gateway > over MPLS > to CME gateway... I have setup everything successful except when a sip phone makes a VOIP branch office 4 digit extension call no ringback is heard on the SIP handset... Voice works and connects fine just no ringback...All my sip calls from CME works 100% out the PBX...

I now have tried Progress_ind setup enable 3 on my inbound VOIP peer on the CME but to no avail also in global conf.. voice call send-alert... Anyone else got grey hair on this one before? Some advice would be appreciated...

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